Example #1
0
func New(quiet bool) *SysInfo {
	sysInfo := &SysInfo{}
	if cgroupMemoryMountpoint, err := cgroups.FindCgroupMountpoint("memory"); err != nil {
		if !quiet {
			log.Printf("WARNING: %s\n", err)
		}
	} else {
		_, err1 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.limit_in_bytes"))
		_, err2 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.soft_limit_in_bytes"))
		sysInfo.MemoryLimit = err1 == nil && err2 == nil
		if !sysInfo.MemoryLimit && !quiet {
			log.Printf("WARNING: Your kernel does not support cgroup memory limit.")
		}

		_, err = ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.memsw.limit_in_bytes"))
		sysInfo.SwapLimit = err == nil
		if !sysInfo.SwapLimit && !quiet {
			log.Printf("WARNING: Your kernel does not support cgroup swap limit.")
		}
	}

	// Check if AppArmor seems to be enabled on this system.
	if _, err := os.Stat("/sys/kernel/security/apparmor"); os.IsNotExist(err) {
		sysInfo.AppArmor = false
	} else {
		sysInfo.AppArmor = true
	}
	return sysInfo
}
Example #2
0
func (d *driver) GetPidsForContainer(id string) ([]int, error) {
	pids := []int{}

	// memory is chosen randomly, any cgroup used by docker works
	subsystem := "memory"

	cgroupRoot, err := cgroups.FindCgroupMountpoint(subsystem)
	if err != nil {
		return pids, err
	}

	cgroupDir, err := cgroups.GetThisCgroupDir(subsystem)
	if err != nil {
		return pids, err
	}

	filename := filepath.Join(cgroupRoot, cgroupDir, id, "tasks")
	if _, err := os.Stat(filename); os.IsNotExist(err) {
		// With more recent lxc versions use, cgroup will be in lxc/
		filename = filepath.Join(cgroupRoot, cgroupDir, "lxc", id, "tasks")
	}

	output, err := ioutil.ReadFile(filename)
	if err != nil {
		return pids, err
	}
	for _, p := range strings.Split(string(output), "\n") {
		if len(p) == 0 {
			continue
		}
		pid, err := strconv.Atoi(p)
		if err != nil {
			return pids, fmt.Errorf("Invalid pid '%s': %s", p, err)
		}
		pids = append(pids, pid)
	}
	return pids, nil
}